We had an iphone 7 plus in recently after our customer had cleaned the phone after water damage and the phone would still not turn on. The water damage was minor and had only affected the top of the board.
Upon inspection we had a 5 amp short on VDD main. We checked over the board and found that capacitors C2609-2611, where all very corroded and needed replacing. We removed these components and tested again, unfortunately the short was still present. We then removed the CPU shield to inspect this area. The shield had not been removed so cleaning of the board could not have been done properly, after removing the shield we found a lot of corrosion above the CPU covering capacitors and resistors. We cleaned the board and saw that there were still several components that were visibly corroded, most seemed minor and we did not think these were a problem. We probed around in diode mode and found one nasty looking capacitor C3325 on the speaker amp line that was short. We removed this capacitor which cleared the short on this line and on the VDD line too, these lines where linked through U3301
We plugged the phone into our power supply and it booted up normally, we tested the basic functions and all seemed fine. We then cleaned the board and reassembled the device and returned it back to our customer who was very happy to return the device to its owner fully working.
We love working on water damaged devices as the owners are always so happy to get their phone and more importantly their data back!
If you have a water damaged device with important photos on please feel free to get in touch. We love a challenge!
Last month we received an iphone 7 in the post from another shop after they had cleaned the motherboard for water damage. The board did not look very corroded, just a few spots but nothing major.
We plugged it into our power supply which showed us that there was a short on the VCC main power line. We removed the board and checked for heat which seemed to come from the bottom of the board on the back near tristar. We looked and could see one cap C3710 near the tristar IC that was discoloured, we removed this and the short cleared. Next we assembled the phone and tested that it would power up, it did.
We then tested basic functions and found that the home button and taptics where not working. There was a lot of corrosion around the home button FPC so tested it with a new screen, which brought back the button functionality but not the touch ID. i then checked the button properly under the microscope and found that the fpc was very corroded. 2 pins had separated from their pads and where not connecting to the flex. We resoldered these connection and tried again on the new screen which resolved the issue.
We still had no taptics so searched the board for a reason, we found corrosion around U3502 the arc driver that is connected to the taptic engine so we removed it, we cleaned the pads, reballed the IC and refitted it. The taptics kicked back in and we had another fully working phone. This repair did take a little longer than most due to there being various faults but we still had it back up and running within 48 hours, if it was just a data recovery job then we could have turned it around a lot faster but as the client wanted their phone back working so we did the extra work to suit their needs.
Just another service offered by the team at microsoldering repairs.